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CNRS

Materials

Acoustic metasurface design completely absorbs low frequency sound

Absorbing low frequency sound is a big job, or at least, a job for big things. Acoustic absorption systems require big resonant cavities with large amounts of heavy damping material and significant surface areas to work efficiently. Consequently, the sound-deadening systems used in music studios and anechoic chambers take up a lot of room. Now scientists have flipped this notion on its head by designing coiled metasurfaces that not only completely absorb low frequency sounds, but are a tiny fraction of the size of traditional sound-absorbing systems.Read More

Electronics

Researchers create sodium battery in industry standard "18650" format

A team of researchers in France has taken a major step towards powering our devices with rechargeable batteries based on an element that is far more abundant and cheaper than lithium. For the first time ever, a battery has been developed using sodium ions in the industry standard "18650" format used in laptop batteries, LED flashlights and the Tesla Model S, among other products.Read More

Science

Tough-as-nails ceramic inspired by mother-of-pearl

Although you may know it simply as the shiny iridescent stuff on the inside of mollusk shells, mother-of-pearl (or nacre) is a remarkable material. It allows those shells, which otherwise consist almost entirely of brittle calcium carbonate, to stand up to the abuses of life in the sea. Now, a team led by the Laboratoire de Synthèse et Fonctionnalisation des Céramiques (CNRS) in Paris, has copied the structure of nacre to create a ceramic material that's almost 10 times stronger than conventional ceramics. Read More

Electronics

Self-assembling plastic nanofibers present cheaper alternative to carbon nanotubes

French researchers have produced highly conducive plastic fibers with a thickness of only a few nanometers that self-assemble when exposed to a flash of light. The tiny fibers (one nanometer equals one billionth of a meter) could become a cheaper and easier-to-handle alternative to carbon nanotubes and play a role in the development of electronic components on the nanoscale.Read More

Science

Versatile new material combines "best qualities" of glass and resin

Synthetic resins start out as viscous liquids that eventually solidify or "cure" into clear or translucent solids. These materials, which combine the desirable properties of strength, durability and light weight, are so useful that you can find them in thousands of applications, particularly aircraft, automobiles and electronic circuits. But for all that versatility, there's one thing that's remained elusive: once cured, resins can not be reshaped. Now, a team from France's National Center of Scientific Research (CNRS), led by award-winning physicist Ludwik Leibler, has developed an inexpensive and easily-produced material that is not only reshapable (like glass), but also repairable and recyclable, again, like glass. That's a potential boon for the auto body industry alone, and the possibilities for other uses are seemingly endless.Read More

Science

Researchers develop first molecular piston capable of self-assembly

Just like a regular-sized device requires a regular-sized motor to operate, a nanodevice likewise requires a molecular-scale motor. In some cases, that motor takes the form of a piston, and building a piston that’s just a few nanometers long ... well, it’s pretty hard. It can and has been done, but it’s an extremely fiddly process. Now, scientists from France’s Centre National de la Recherche Scientifique (CNRS) and the Université de Bordeaux, along with colleagues in China, have developed a molecular piston that is capable of assembling itself.Read More

Science

Laser Triggers Electrical Activity in Thunderstorm

April 14, 2008 A team of European scientists has deliberately triggered electrical activity in thunderclouds for the first time, according to a new paper in the latest issue of Optics Express, the Optical Society’s (OSA) open-access journal. They did this by aiming high-power pulses of laser light into a thunderstorm. The laser beams were supplied by the Teramobile - a nine-ton portable terawatt and femtosecond laser which fits inside a standard six-meter freight container. Its pulses have an instantaneous power of 5 terawatts (5TW = 5 x 1012W or the power equivalent of a thousand nuclear reactors) and a duration of approximately 100 femtoseconds (1013 s.).Read More

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